Topic leaderboard
CPC C21C
Ranked by the PatentIndex Score — a 1–99 percentile within C21C · public-visibility date · generated 2026
top 25 per window · public-visibility date
Rising· last 2 yrs
Inventors whose newest C21C patents became public in the last 2 years — the current frontier
- 199James A. Mennell28 patents · 557 citations
- 296Daniel J. Despen26 patents · 535 citations
- 392Steve Filips12 patents · 142 citations
- 488Adolfredo Alvarez5 patents · 14 citations
- 583Ai Quoc Pham5 patents · 14 citations
- 679Sandeep Nijhawan5 patents · 14 citations
- 775Steven Fatur5 patents · 14 citations
- 871Michael J. Strelbisky8 patents · 38 citations
- 967Troy D. Ward6 patents · 17 citations
- 1063DESPEN DANIEL J5 patents · 0 citations
- 1158MENNELL JAMES A5 patents · 0 citations
- 1254Emmanuel Lucas6 patents · 9 citations
- 1350Guillaume Stechmann6 patents · 9 citations
- 1446Matthieu Salib6 patents · 9 citations
- 1542Jonathan Hale Perkins7 patents · 4 citations
- 1638John Francis Quanci7 patents · 4 citations
- 1733John Michael Richardson7 patents · 4 citations
- 1829Andrew Michael Butor6 patents · 0 citations
- 1925Chun Wai Choi6 patents · 0 citations
- 2021David James Schwake6 patents · 0 citations
- 2117Patrick J. Mullarkey6 patents · 0 citations
- 2213Sebastian Cobo3 patents · 7 citations
- 238Guangsheng Wei7 patents · 7 citations
- 244Kai Dong7 patents · 7 citations
- 251Rong Zhu8 patents · 7 citations
Active· last 5 yrs
Sustained C21C output across the last 5 years
- 199James A. Mennell28 patents · 557 citations
- 296Daniel J. Despen26 patents · 535 citations
- 392Steve Filips12 patents · 142 citations
- 488Rodney James Dry30 patents · 341 citations
- 583Guido Jacobus Neyens10 patents · 78 citations
- 679Matthew A. Cibula8 patents · 28 citations
- 775Paul E. King8 patents · 28 citations
- 871C. Rigel Woodside6 patents · 25 citations
- 967Adolfredo Alvarez5 patents · 14 citations
- 1063Ai Quoc Pham5 patents · 14 citations
- 1158Sandeep Nijhawan5 patents · 14 citations
- 1254Steven Fatur5 patents · 14 citations
- 1350Michael J. Strelbisky8 patents · 38 citations
- 1446Edward W. Albrecht6 patents · 11 citations
- 1542Steven Daryl Mccullough6 patents · 11 citations
- 1638Mark Hayton7 patents · 50 citations
- 1733Silvio Maria Reali11 patents · 27 citations
- 1829Troy D. Ward6 patents · 17 citations
- 1925Naoki Kikuchi14 patents · 23 citations
- 2021DESPEN DANIEL J5 patents · 0 citations
- 2117MENNELL JAMES A5 patents · 0 citations
- 2213Joseph S. Strasser5 patents · 14 citations
- 238Emmanuel Lucas6 patents · 9 citations
- 244Guillaume Stechmann6 patents · 9 citations
- 251Matthieu Salib6 patents · 9 citations
All-time canon
Career PatentIndex Score in C21C
- 199James A. Mennell28 patents · 557 citations
- 296Daniel J. Despen26 patents · 535 citations
- 392Paul V. Cooper13 patents · 1,213 citations
- 488Christopher J. Nagel13 patents · 870 citations
- 583George S. Mordue6 patents · 544 citations
- 679Gregory M. Gitman12 patents · 498 citations
- 775Grigori Galperine7 patents · 289 citations
- 871Stanislav I. Zhigach6 patents · 256 citations
- 967Emile Lonardi12 patents · 683 citations
- 1063John Erling Anderson13 patents · 506 citations
- 1158Pravin Chandra Mathur9 patents · 400 citations
- 1254John A. Vallomy10 patents · 316 citations
- 1350Robin John Batterham7 patents · 256 citations
- 1446Valery Shver16 patents · 309 citations
- 1542Steve Filips12 patents · 142 citations
- 1638Rodney James Dry30 patents · 341 citations
- 1733Ronald J. Selines11 patents · 278 citations
- 1829Ernst Fritz10 patents · 294 citations
- 1925Micheal D. Labate13 patents · 282 citations
- 2021Grigory M. Gitman5 patents · 240 citations
- 2117William John Mahoney16 patents · 267 citations
- 2213Gregory J. Hardie6 patents · 184 citations
- 238Ralph Weber5 patents · 200 citations
- 244Karl Brotzmann34 patents · 350 citations
- 251Cecil Peter Bates6 patents · 170 citations
Rising· last 2 yrs
The top-scoring C21C patents made public in the last 2 years
- 199US12371755B2✦ AISteel sheet and high strength press hardened steel part having excellent bending and metho2 cites · 202555% earned
- 296US12146200B1✦ AIMethod and device for controlling temperature of molten steel during ladle furnace (LF) re4 cites · 202482% earned
- 392US12404571B2✦ AISteel sheet and high strength press hardened steel part having excellent bending anisotrop3 cites · 202563% earned
- 488US11940216B1High-temperature flue gas recovery apparatus for melting furnace2 cites · 202476% earned
- 583US11987855B2Method and system for determining converter tapping quantity1 cites · 202467% earned
- 679US12577488B2Systems and apparatus for production of high-carbon biogenic reagents0 cites · 20240% earned
- 775US12370599B2Treating cooling water in iron production facilities, and associated systems, devices, and0 cites · 20250% earned
- 871US12577696B2Ore dissolution and iron conversion system0 cites · 20240% earned
- 967US12292237B2Metallurgical furnace having an integrated off-gas hood0 cites · 20240% earned
- 1063US12191125B2Removing metal contamination from surfaces of a processing chamber0 cites · 20240% earned
- 1158US12344917B2Energy-efficient pyrometallurgical process for treating Li-ion batteries0 cites · 20240% earned
- 1254US12252753B2Systems and methods for self-reduction of iron ore0 cites · 20240% earned
- 1350US12258671B2Reactors and methods for production of sustainable chemicals using carbon emissions of met0 cites · 20240% earned
- 1446US12378619B2Process for manufacturing a slag conditioning agent for steel desulfurization0 cites · 20240% earned
- 1542US12416055B1Carbon dioxide emission reduction system for electric arc furnaces utilizing algae for car0 cites · 20250% earned
- 1638US12259186B2Single mounting cast iron or copper stave cooler0 cites · 20240% earned
- 1733US12006994B2Valve spring0 cites · 20240% earned
- 1829US12378649B2Method for producing hypereutectoid steel rail resistant to contact fatigue0 cites · 20240% earned
- 1925US12503737B2Sustainable steel production with co-generation of hydrogen0 cites · 20240% earned
- 2021US12195361B2System and method to sustainable integrated wastewater treatment and air-cooling in a stee0 cites · 20240% earned
- 2117US12123063B2Converter bottom blowing system capable of allowing multiple media to share bottom blowing0 cites · 20240% earned
- 2213US12071681B2Method for smelting low-phosphorus high-manganese steel based on reduction dephosphorizati0 cites · 20240% earned
- 238US12566029B2Method of producing molten iron using electric furnace including video device0 cites · 20240% earned
- 244US12584690B2Liquid level detection method and detection apparatus for the same, molten material liquid0 cites · 20240% earned
- 251US12523257B2Bearing seat assembly and converter device0 cites · 20240% earned
Active· last 5 yrs
The top-scoring C21C patents of the last 5 years
- 199US11851723B2✦ AICarbon-negative metallurgical products22 cites · 202280% earned
- 296US12371755B2✦ AISteel sheet and high strength press hardened steel part having excellent bending and metho2 cites · 202555% earned
- 392US12146200B1✦ AIMethod and device for controlling temperature of molten steel during ladle furnace (LF) re4 cites · 202482% earned
- 488US12404571B2Steel sheet and high strength press hardened steel part having excellent bending anisotrop3 cites · 202563% earned
- 583US11767604B22-step iron conversion system5 cites · 202262% earned
- 679US11946108B2Foundry coke products and associated processing methods via cupolas4 cites · 202375% earned
- 775US11326217B1Method and system for predicting addition amount of slagging lime during LF refining, and 5 cites · 202284% earned
- 871US11545239B1Method for predicting yield of calcium in a calcium treatment process based on deep neural3 cites · 202280% earned
- 967US11359154B2Systems and apparatus for production of high-carbon biogenic reagents4 cites · 202147% earned
- 1063US11940216B1High-temperature flue gas recovery apparatus for melting furnace2 cites · 202476% earned
- 1158US11653426B2Methods of protecting furnace electrodes with cooling liquid that contains an additive3 cites · 202161% earned
- 1254US11243273B2Estimation or control of lengths and positions of one or more transversely localized elect3 cites · 202172% earned
- 1350US11852414B2Device for maintaining a tap hole of an electric arc furnace3 cites · 202180% earned
- 1446US11702713B2Process and plant for preheating a metal charge fed in continuous to an electric melting f4 cites · 202175% earned
- 1542US11661638B2Recovery of nickel and cobalt from Li-ion batteries or their waste2 cites · 202261% earned
- 1638US11572307B1Process for modifying steel slag through acidification and carbonization coupling2 cites · 202376% earned
- 1733US11815313B2Metallurgical furnace having an integrated off-gas hood2 cites · 202261% earned
- 1829US11459627B2Estimation of arc location in three dimensions2 cites · 202161% earned
- 1925US11959813B2Device and method for measuring a temperature of a molten metal2 cites · 202176% earned
- 2021US11987855B2Method and system for determining converter tapping quantity1 cites · 202467% earned
- 2117US11938557B2Sonotrode for processing of liquid metals and a method for processing of liquid metals2 cites · 202276% earned
- 2213US11926884B2Pyrometallurgical process for recovering nickel, manganese, and cobalt2 cites · 202376% earned
- 238US11821691B2Gas injection nozzle refractory and gas injection nozzle2 cites · 202276% earned
- 244US11842888B2Removing metal contamination from surfaces of a processing chamber1 cites · 202350% earned
- 251US11773025B2Red mud-based composite calcium ferrite and preparation method and use thereof1 cites · 202367% earned
All-time canon
The defining C21C patents of the whole record
- 199US5108192A✦ AIProbe for taking gas samples and heat measurements in a shaft furnace497 cites · 199295% earned
- 296US5199866A✦ AIAdjustable momentum self-cooled oxy/fuel burner for heating in high temperature environmen167 cites · 199394% earned
- 392US5443572A✦ AIApparatus and method for submerged injection of a feed composition into a molten metal bat165 cites · 199594% earned
- 488US6689310B1Molten metal degassing device and impellers therefor160 cites · 200494% earned
- 583US4898367ADispersing gas into molten metal156 cites · 199094% earned
- 679US4574714ADestruction of toxic chemicals153 cites · 198694% earned
- 775US4351514AApparatus for purifying molten metal151 cites · 198294% earned
- 871US5491279AMethod for top-charging solid waste into a molten metal bath146 cites · 199690% earned
- 967US5143357AMelting metal particles and dispersing gas with vaned impeller144 cites · 199288% earned
- 1063US5310412AMelting metal particles and dispersing gas and additives with vaned impeller143 cites · 199488% earned
- 1158US5858059AMethod for injecting feed streams into a molten bath141 cites · 199993% earned
- 1254US4877449AVertical shaft melting furnace and method of melting137 cites · 198993% earned
- 1350US4954167ADispersing gas into molten metal136 cites · 199093% earned
- 1446US4884786AApparatus for generating a vortex in a melt133 cites · 198993% earned
- 1542US6358467B1Universal coupling132 cites · 200293% earned
- 1638US3954134AApparatus for treating metal melts with a purging gas during continuous casting128 cites · 197693% earned
- 1733US7476357B2Gas mixing and dispersement in pumps for pumping molten metal128 cites · 200693% earned
- 1829US4797087AMethod and apparatus for generating highly luminous flame124 cites · 198993% earned
- 1925US6723276B1Scrap melter and impeller123 cites · 200487% earned
- 2021US4940214AApparatus for generating a vortex in a melt122 cites · 199093% earned
- 2117US4496393AImmersion and vaporization chamber122 cites · 198593% earned
- 2213US7497988B2Vortexer apparatus120 cites · 200693% earned
- 238US5571486AMethod and apparatus for top-charging solid waste into a molten metal bath119 cites · 199690% earned
- 244US5537940AMethod for treating organic waste119 cites · 199693% earned
- 251US4602574ADestruction of toxic organic chemicals118 cites · 198693% earned
Rising· last 2 yrs
Assignees whose newest C21C patents became public in the last 2 years — the current frontier
- 199CARBON TECH HOLDINGS LLC28 patents · 287 citations
- 296WURTH PAUL SA43 patents · 870 citations
- 392NIPPON STEEL CORP108 patents · 853 citations
- 488ELECTRASTEEL INC6 patents · 14 citations
- 583SYSTEMS SPRAY COOLED INC6 patents · 17 citations
- 679ARCELORMITTAL11 patents · 11 citations
- 775UNIV BEIJING SCIENCE & TECHNOLOGY13 patents · 18 citations
- 871JFE STEEL CORP48 patents · 21 citations
- 967SUNCOKE TECH & DEVELOPMENT LLC7 patents · 4 citations
- 1063UMICORE NV4 patents · 4 citations
- 1158LHOIST RECH ET DEVELOPPEMENT SA6 patents · 0 citations
- 1254SAUDI ARABIAN OIL CO4 patents · 1 citations
- 1350SMS GROUP GMBH9 patents · 1 citations
- 1446LAM RES CORP2 patents · 1 citations
- 1542ZHEJIANG HAILIANG CO LTD1 patents · 2 citations
- 1638DAYE SPECIAL STEEL CO LTD2 patents · 0 citations
- 1733INSTITUTE OF RES OF IRON AND STEEL JIANGSU PROVINCE/SHA STEEL CO LTD CN2 patents · 0 citations
- 1829MACRAE TECH INC2 patents · 0 citations
- 1925UNIV NORTH CHINA SCIENCE & TECHNOLOGY2 patents · 0 citations
- 2021CHARM IND INC1 patents · 0 citations
- 2117CIX INC1 patents · 0 citations
- 2213Dioxycle1 patents · 0 citations
- 238PANGANG GROUP PANZHIHUA IRON & STEEL RES INSTITUTE CO LTD1 patents · 0 citations
- 244SCHAEFFLER TECHNOLOGIES AG1 patents · 0 citations
- 251SHANDONG IRON & STEEL CO LTD1 patents · 0 citations
Active· last 5 yrs
Sustained C21C output across the last 5 years
- 199CARBON TECH HOLDINGS LLC28 patents · 287 citations
- 296WURTH PAUL SA43 patents · 870 citations
- 392UNITED STATES STEEL CORP40 patents · 560 citations
- 488NIPPON STEEL CORP108 patents · 853 citations
- 583DANIELI OFF MECC31 patents · 282 citations
- 679HERAEUS ELECTRO NITE INT27 patents · 158 citations
- 775NUCOR CORP13 patents · 136 citations
- 871FOSECO INT23 patents · 218 citations
- 967KOBE STEEL LTD23 patents · 152 citations
- 1063MIDREX TECHNOLOGIES INC8 patents · 104 citations
- 1158ELKEM MATERIALS17 patents · 97 citations
- 1254KW ASS LLC8 patents · 28 citations
- 1350ELECTRASTEEL INC6 patents · 14 citations
- 1446MITSUBISHI HEAVY IND LTD6 patents · 43 citations
- 1542TECHEMET LP6 patents · 11 citations
- 1638AIR PROD & CHEM7 patents · 177 citations
- 1733SYSTEMS SPRAY COOLED INC6 patents · 17 citations
- 1829TATA STEEL LTD9 patents · 18 citations
- 1925ARCELORMITTAL11 patents · 11 citations
- 2021CHEMTREAT INC5 patents · 14 citations
- 2117MM METALS USA LLC4 patents · 18 citations
- 2213UNIV BEIJING SCIENCE & TECHNOLOGY13 patents · 18 citations
- 238JFE STEEL CORP48 patents · 21 citations
- 244POSCO16 patents · 19 citations
- 251REFRACTORY INTELLECTUAL PROPERTY GMBH & CO KG11 patents · 13 citations
All-time canon
All-time PatentIndex Score in C21C
- 199CARBON TECH HOLDINGS LLC28 patents · 287 citations
- 296MOLTEN METAL TECH INC5 patents · 690 citations
- 392COOPER PAUL V8 patents · 681 citations
- 488AMERICAN COMBUSTION INC12 patents · 631 citations
- 583PRAXAIR TECHNOLOGY INC31 patents · 874 citations
- 679TECH RESOURCES PTY LTD51 patents · 1,033 citations
- 775WURTH PAUL SA43 patents · 870 citations
- 871AIR LIQUIDE33 patents · 523 citations
- 967NIPPON KOKAN KK50 patents · 702 citations
- 1063ALCAN INT LTD9 patents · 283 citations
- 1158PROCESS TECHNOLOGY INTERNATION8 patents · 229 citations
- 1254VOEST ALPINE IND ANLAGEN40 patents · 466 citations
- 1350UNITED STATES STEEL CORP40 patents · 560 citations
- 1446NIPPON STEEL CORP108 patents · 853 citations
- 1542ARMCO INC11 patents · 275 citations
- 1638LABATE M D9 patents · 239 citations
- 1733INLAND STEEL CO21 patents · 296 citations
- 1829SUMITOMO METAL IND36 patents · 413 citations
- 1925DANIELI OFF MECC31 patents · 282 citations
- 2021VOEST ALPINE AG41 patents · 354 citations
- 2117BETHLEHEM STEEL CORP30 patents · 382 citations
- 2213ASEA AB53 patents · 473 citations
- 238MANNESMANN AG61 patents · 449 citations
- 244VOEST AG36 patents · 280 citations
- 251ARBED38 patents · 327 citations
90–99 field-defining50–89 strong<50 emergingearned by citationsfrom family breadth